http://bianzhirensheng.com/a/39524_zhifa.html ...
https://i.ibb.co/wB2XXH3/Page-00001.jpg https://...
. . ...
"" 1. 1. 1. 1.
:
20
: ( ) 22 30 4 = 10 10 .
"--": 1 - 2 - ,... 46 - 47 - 48 -